De-Bugging a house

So I have a legacy house that is 6 generations in and it is getting really buggy. People stand around and wait for a good 30 seconds before starting the next task- the laundry baskets don't have the do laundry option available anymore but there is nothing in the washing machine (had to delete it and buy a new one) my Toddler with level 5 movement can't use the stairs -- all weird stuff that comes from having so many generations of Sims live in the same house with the same stuff -- I mean the majority of the stuff is the equivalent to 200 years old, so I guess I shouldn't complain, but does anyone know how to sort of "re-set" the lot and the stuff on it without deleting it?

I tried to use the "debug" option to fix the washer and the toddler but it didn't help.